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Photocatalyst of zinc oxide possessing visible light activity and preparation method

A zinc oxide and catalyst technology, applied in the field of zinc oxide photocatalyst and its preparation, can solve the problem of photocatalyst inactivation and other problems, and achieve the effect of enriching research and application content, easy implementation and promoting development

Inactive Publication Date: 2006-11-22
SOUTH CHINA UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] One: TiO 2 Dye photosensitization of photocatalysts, sensitization requires TiO 2 Adsorb dyes, however, they are difficult to be applied to photocatalytic degradation reactions, because they themselves will also be degraded and the photocatalyst will lose its activity

Method used

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  • Photocatalyst of zinc oxide possessing visible light activity and preparation method
  • Photocatalyst of zinc oxide possessing visible light activity and preparation method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] In the flask of 500ml, add 1.0g zinc acetate dihydrate, 5g polyvinylpyrrolidone (molecular weight 20,000), be dissolved in ethylene glycol respectively and mix homogeneously, wherein the weight ratio of zinc acetate dihydrate and polyvinylpyrrolidone is 0.2: 1, The weight ratio of ethylene glycol to zinc acetate dihydrate is 300:1; heat up to 140°C under strong stirring, condense and reflux for 5 hours, separate the precipitate by suction filtration while it is hot, wash with absolute ethanol three times, and dry at 120°C 30min, and finally roasted at 300°C to obtain zinc oxide with visible light activity.

Embodiment 2

[0022] Add 1.0g zinc acetate dihydrate and 2.0g polyvinylpyrrolidone (molecular weight: 30,000) in a 500ml flask, dissolve them in ethylene glycol and mix evenly, wherein the weight ratio of zinc acetate dihydrate to polyvinylpyrrolidone is 0.5: l , the weight ratio of ethylene glycol to zinc acetate dihydrate is 200:1; start to heat up to 195°C under vigorous stirring, condense and reflux for 3 minutes, separate the precipitate by suction filtration while it is hot, wash with absolute ethanol 3 times, and heat up to 120°C Drying for 30 minutes, and finally calcination at 600°C, to obtain zinc oxide with visible light activity.

Embodiment 3

[0024] Add 1.0g of zinc acetate dihydrate and 0.25g of polyvinylpyrrolidone (molecular weight: 60,000) into a 500ml flask, dissolve them in ethylene glycol and mix well, wherein the weight ratio of zinc acetate dihydrate to polyvinylpyrrolidone is 4:1 , the weight ratio of ethylene glycol to zinc acetate dihydrate is 50:l; under strong stirring, start to heat up to 200°C, condense and reflux for 1h, separate the precipitate by suction filtration while it is hot, wash with absolute ethanol three times, and heat up to 120°C Dry for 30 minutes, and finally bake at 700°C to obtain zinc oxide with visible light activity.

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Abstract

The invention provides a method for preparing a zinc oxide photocatalyst with visible light activity, which comprises dissolving zinc acetate dihydrate and polyvinylpyrrolidone in ethylene glycol, then mixing evenly, heating and reflux under stirring, and obtaining the zinc oxide photocatalyst of the present invention. Zinc oxide. The zinc oxide catalyst prepared by the present invention has a degradation rate of methyl orange in water under visible light that is more than 2 times higher than that of existing commercially available titanium dioxide and commercially available zinc oxide; the present invention adopts the common raw material of zinc acetate to prepare zinc oxide, without Modifications such as noble metals have the characteristics of easy implementation and low cost, and high activity for the oxidative degradation of organic matter under visible light.

Description

technical field [0001] The invention relates to the field of chemical industry, in particular to a zinc oxide photocatalyst with visible light activity and a preparation method thereof. Background technique [0002] Since the discovery of TiO by Fujishima and Honda in 1972 2 Since single crystal electrodes can not only decompose water but also decompose other substances under the action of light, photocatalytic reactions have received widespread attention in environmental governance and energy development. The research and development of photocatalytic materials has become a hot research topic at home and abroad. . However, most of the reported photocatalytic efficiency is low, the band gap is wide, and they can only show photochemical activity in the ultraviolet region. However, in the solar spectrum, ultraviolet light (below 400nm) is less than 5%, while visible light with a wavelength of 400-750nm accounts for 43%. If the photocatalyst cannot...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J23/06B01J37/03C01G9/02
Inventor 彭峰陈水辉王红娟张雷
Owner SOUTH CHINA UNIV OF TECH